Sepoy Harbhajan Singh was born on 30 August 1946 in Sadrana village, Tarn Taran district, Punjab. He joined the Indian Army in 1966 and was enrolled in the 23 Punjab Regiment. After completing his training, he was posted to the Nathu La sector in the eastern Himalayas, one of India's most strategically important border regions following the 1962 Sino-Indian War and the 1967 Nathu La clashes.
On 4 October 1968, while escorting a mule convoy carrying supplies through difficult mountain terrain near Nathu La Pass, he reportedly slipped into a fast-flowing mountain stream and lost his life during the line of duty. His body was recovered several days later.
Over the years, fellow soldiers developed a long-standing tradition of honouring Harbhajan Singh, believing that his spirit continued to watch over troops serving along the India–China border. This belief led to the establishment of the Baba Harbhajan Singh Temple near Nathu La, where soldiers continue to pay their respects. These traditions are part of military folklore and cultural practice rather than official military doctrine.
Today, Sepoy Harbhajan Singh is remembered as a symbol of dedication, discipline and service. His memorial at Nathu La remains an important place of remembrance for soldiers and visitors, reflecting the respect earned through his service to the nation.